Cheap, clean, mass produced hydrogen!
Efficient hydrogen storage materials!
Watching the headlines, the two areas of energy production advancing at an accelerating rate are hydrogen production and solar cell efficiency. I believe these technologies are the basis of the future, based on quantity of discoveries announced alone.
Insect killing fungus injects scorpion poison directly into the bloodstream. Ummm, what stops this fungus (or another variation) from doing the same thing to large creatures such as rats, dogs, humans?
I'm not a believer myself, but I'm wondering if these sightings, if true, would be better explained as multidimensional travelers rather than space faring craft in the traditional sense.